Welcome to HCM.West Nile fever
is an arthropod borne disease meaning it is caused by mosquito bite. This is a viral fever
which presents as sudden fever and then within 48 hours progresses to encephalitis
(brain fever). This infection needs to be treated as soon as possible as there is chances of late complications. I suggest a detailed neurological examination for the memory loss
. It could get worse if not treated immediately.
There is rare chance of repeated infection in West Nile fever because once you get the infection you gain immunity for life time.